iOS (jailbroken): Waiting for the camera app to load (and having other people see it on your screen) doesn't exactly make for good covert photos. QuickShoot is a jailbreak tweak that takes a picture from your home screen without even opening the camera app.

Jailbreaking is a process that changes little by little with each iOS upgrade. Rather than always…
Read more Read more

After you install the tweak, you can take an image just by finding the Camera icon on your home screen and double-tapping it. You'll see a small badge on the app to show its working, and when it's done, you'll have that photo in your gallery. Of course, this means you can't frame up your shot or anything like that, but it's good for snapping a secret picture without others knowing (something we've talked about before). You can change flash settings, choose which camera to use, and turn on HDR in the app's Settings pane as well.